The Holy Quran on fasting

"O ye who believe! Fasting is prescribed for you, as it was prescribed for those before you, so that you may become righteous. 

"The prescribed fasting is for a fixed number of days, but whoso among you is sick or is on a journey shall fast the same number of other days; and of those who are able to fast only with great difficulty is an expiation - the feeding of a poor man. And whoso performs a good work with willing obedience, it is better for him. And fasting is good for you, if you only knew. 

"The month of Ramadhan is that in which the Quran was sent down as a guidance for mankind with clear proofs of guidance and discrimination. Therefore, whosoever of you is present at home in this month, let him fast therein. But whoso is sick or is on a journey, shall fast the same number of other days. Allah desires to give you facility and He desires not hardship for you, and that you me complete the number, and that you may exalt Allah for His having guided you and that you may be grateful. 

"And when My servants ask thee about Me, say: I am near. I answer the prayer of the supplicant when he prays to Me. So they should hearken to Me and believe in Me, that they may follow the right way. 

"It is made lawful for you to go in unto your wives on the night of the fast. They are a garment for you, and you are a garment for them. Allah knows that you have been acting unjustly to yourselves, wherefore He has turned to you with mercy and afforded you relief. So you may now go in unto them and seek what Allah has ordained for you; and eat and drink until the white thread becomes distinct to you from the black thread of the dawn. Then complete the fast till nightfall and do not go in unto them while you remain in the Mosques for devotion. These are the limits fixed by Allah, so approach them not. Thus Allah make His commandments clear to men that they become secure against all evil." (2:183-187)